-- @testpoint: opengauss关键字command_function(非保留)，作为函数名，部分测试点合理报错

--关键字不带引号-成功
drop function if exists command_function;
create function command_function(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists command_function;
--关键字带双引号-成功
drop function if exists "command_function";
create function "command_function"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "command_function";
--关键字带单引号-合理报错
drop function if exists 'command_function';
create function 'command_function'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `command_function`;
create function `command_function`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/